Improvement in hoisting-machines



U'Nrrn STATES PATENT Trice.

SAMUEL B. PHELPS AND CHARLES A. SLAGK, OF NOBWIGH, VERMONT.

IMPROVEMENT IN HOSTING-MACHINES.

Specification forming part of Letters Patent No. 47,036, dated March 28,1865.

To @ZZ whom it may concern:

Be it known that we, S. B. PHELPs and C. A. SLACK, of Norwich, in thecounty of Vindsor and State of Vermont, have invented a new and usefulMachine for Raising Heavy Bodies; and we do hereby declare the same tobe fully described in the following specication, and represented in theaccompanying drawings, of which- Figure l denotes a top view, and Fig. 2a side elevation, of it.

In such drawings, A exhibits a windlass, from which depends a chain, a.The journals of .this windlass are supported in suitable bearings withinan upright frame, B, constructed as represented in the figures.

0n the shaft of the windlass are two levers, C C', such shaft being thefulcrum of each of them. Two ratchets, D D', are arranged on and appliedto the windlass, each being in close contiguity to one of the levers,and engaging with one of two impelling pawls, E E', which are carried bythe said levers.

On each lever a slider, F or F', is arranged, as shown in the drawings,each slider being connected with one of two horizontal screws, G Gr',which are arranged across the top of the frame B and screw into boxes HH', fastened to such frame. The screwshafts revolve within and aresupported by two other boxes, I I', fixed on such frame. The connectionof the slider with its lever and screw is such as not only to cause thescrew while being revolved to move the lever on its fulcrum, but toenable the slider to move on and lengthwise of the lever.

In each screwshaft there is a long groove, b, which receives aprojection or feather from the hub of a bevel-gear, K or K', whichslides freely on the screw-shaft and is placed against or close to oneof the girts c c of the upper part of the frame. Fig. 3 represents asection of the gear, its shaft, and feather.

The two gears K K' respectively engage with gears L L', fixed on ashaft, M, which is arranged between and at right angles to the twoscrew-shafts and is supported within a box, N. We would remark thatinstead of the four bevel-gears, as above described, there may be asingle spur-gear arranged on each of the screw-shafts, such spur-gearsbeing :made to engage with each other 5 but on some accounts it ispreferable and may be more convenient to employ the four bevel-gears..

Two projections, O O', extend from the frame B and directly in front ofand against the hubs of the bevel-gears K K', such pro jections, wit-hlthe frame-girt, as mentioned, being for the purpose of maintaining thebevel-gears in their respective positions while they may be inrevolution.

A crank, l?, is fixed on one of the screwshafts, or there may be suchacrank attached to each of them. Y

Each pawl E or E' is provided with a tripper, R or R', which consists ofa slider or bar supported by two cross-bars, S S', of the frame, and soarranged as to be capable of being pushed lengthwise against the pawl,so as to force and hold it out of engagement with its ratchet.

By laying hold of either of the cranks and revolving it for a while inone direction, and next turning it for a similar period in an 0ppositedirection, we shall produce, by means of the screws, thelevers, pawls,and ratchets, a continuous rotation of the windlass in one direction. Asthe two levers while in motion always move opposite ways relatively toone another, the pawl of one will be impelling its ratchet while thepawl of the other will be slipping backward on and imparting no motionto its own ratchet.

By means of the pawl-trippers lR It' both pawls may be forced out ofengagement with their ratchets, so as to enable the windlass and itsratchets to be freely rotated by a weight when suspended from its chain.

The apparatus or machine as described is of much utility and veryconvenient inra-is ing stone or various other heavy bodies.

Ve claim as our inventionl. The combination of the windlass A, theratchets D D', pawls E E', the levers C C', the sliders F F', the screwsG G', the screwboxes H H', (or their equivalents,) and the gears forconnecting the shafts, the whole being arranged and applied to the frameB and its projections O O', and so as to operate together, substantiallyas speciiied.

2. The combination of the two pawl-trippers E It', or their mechanicalequivalents, with the said windlass, its ratchets, pawls, levers,slides, screws, and the connectinggears thereof, the whole beingarranged in manner and so as to operate substantially as sot forth.

SAML. B. PHELPS. OHAS. A. SLAOK. Witnesses:

JOHN L. GURRIN, linnnJ N. CLARK..

